Driving connection



B. M. W. HA-NSON DRIVING oNNEc'rioN Filed April 15, 1921 III IIIII S14/gente@ Ill Patented Oct. 13, 1925.

UNITED STATES PATENT OFFICE.

BENGT BLW. HANSON, F HARTFORD, CONNECTICUT; EINAR A. HANSON AND CLAR- ENCE E. WHITNEY ADMINISTBATORSOF SAID BENGT M. W. HANSON, DECEASED.

DRIVING CONNECTION.'

Application led April 16, 192l. Serial No. 461,958.

To all lwhom it may concern:

Be it known that I, BENGT M. W. HANsoN, a citizen of the United States, residing at Hartford, inthe county of Hartford, State of Connecticut, have'invented certain new and useful Improvements in a Driving Connection, of-which the following is a specification.

The aim of the presentV invention is to provide a simple and effective driving conwithout'jar or shock and at the same time.

with precision.

The driving connection herein disclosed finds peculiar adaptability in metal working machines. The embodiment of the invention herein selected for purpose ofv illustration will be described with reference to its use in connection with means for reversing the direction of movement of a recipro-` cal work carrier or bed of a metal working machine, but it is to be understood that the present disclosure is by way of illustration only, it not being intended to limit the invention to thisparticular use and it being susceptible of other embodiments than that herein shown'.

In the accompanying drawings:

Fig. 1 is a` longitudinal sectional view through the device of the present invention as applied to a metalworking machine which is illustrated only in part, as the particular construction thereof. is immaterial.

Figs. 2, 3 and'4 are sectional views taken on the respective lines 2v2, 3-3 and 4-4 of Fig. -1.

Referring to the drawings in detail, a is the driving member and b the driven member, between which the driving connection of the present invention is interposed. In the present illustrative disclosure, thedriven member carries a pinion o which meshes with a' rack d on a work carrier or bed e mounted for reciprocation on the frame f of the machine. Associated with the driving' member a is a reversing gear designated generally by the letter g and which may be of any suitable construction.

eferring now to the device forming the subject matter of the present invention, it will be-seen that fixed to the driven shaft b, as by means of a pin 10, is a socket or head 11 into which the shaft a extends. The shaft a may have a bearingas at 12 in the. end wall of the head. Interposed between the head 11 and shaft a are a plurality of frictional disks some of which are keyed to the head and others to the shaft a. In the present instance, the alternate disks' 13a. 13b and 13c are keyed as at 14 to the shaft a. The intervening disks 15, 15b `and 15" have driving connection with the headthrough a key 16. The disk 15 is keyed, asl most clearly shown in Fig. 2, against all rotary movement relative to the head 11. The keyway 161 in the periphery of the disk 15b (see Fig. 3) is such as to permit of a limited rotary movement of this disk relative to the head. The keyway 16 in the periphery of the disk 15c (see Fig. 4) is of greater length than the keyway 16h so that this disk will have a `greater angular movement relative to the head than will the disk 15". In one manner of speaking, the end wall of the head 11, and against which the disk 13a fricti'onally engages, constitutes a frictional disk. Carried by the plate 13 is a stop pin 19 which works in an arcuate slot 20 in the disk 15c and, preferably, this slot is of greater length than the keyway 16. Engaging against the disk 150, and connected by pins 22 to the disk 13 so as to 'rotate therewith, is a plate 23. The disks are pressed against one another by springs 24 acting through the plungers 25 bearing against the plate 23. These springs and plungers are carried by a cover plate 26 secured, as shown, to the open yend of the head 11. The force of the and the presser 'plate 23 will also be im- .mediately reversed and the frictional forces between the abutting faces of the end wall of the head 11 and thel disks 13, 15" and 13b first become effective to slow 105 down the speed of rotation of the driven member b. The disk 15b will rotate in unison with the disks 13b and 13 untilthe end of the keyway 16b engages the key 16, and then thefrictional forces between these 11 a that of the disks keyed to the driven member until the stop pin 19 engages the end of the slot 2() and thenv the direction of rotation of the driven member will be reversed.

A driving connection ot this sort finds peculiar utility in the drive of a reciprocating work bed of a metal working machine, such, for instance, as a grinding machine whereit is of importance to reverse the di- ,.rection .of movement of the bed without racking or shaking the parts but with precision. It will be seen that by the use of the present invention, the momentum of the bed at the endof each of its strokes is gradually reduce'd and that at the instant of reversal it has substantially lost its momentum so that the reversal is very smoothly effected, and thus chattering and jars which may cause the tool to nick or mar the work are eliminated. Due to the fact that relative rotation between the driving and driven members is positively limited by the pin 19, the direction of movement of the bed e will be reversed with precision so that the work will be moved relative to the grinding wheel or other tool to the exact predetermined extent, and this is of advantage, for instance, when it is desired to cut or grind the work up to a shoulder thereon.

I claim as my invention 1. In a device of the character described, a driving member, a driven member, a set of friction disks associated with each of said members so as to be driven thereby, the disks of one set being in cooperative engagement with those of the other set, and means positively connecting a disk of one set with a disk of the other set to thereby limit the extent of rotation between said members.

2. In a device .of the character described, a driving member, a driven member', a plurality of frictional elements therebetween `ing member` intervening disks keyed to said driven member, the key-ways 1n said interand arranged to successively come into o 55 eration to effect a braking action on t e driven member upon reversal of rotation of the driving member, and means for positively limiting the extent of relative rotation between said members. t

3. In a device of the character described, a driving member, a driven member, frictional elements interposed therebetween, means for successively preventing the ele-l ments connected to one of said members from rotating in unison with those 'connected to the other of said members upon reversal of rotation of the driving member, and means fior positively limiting the extent of relative rotation between said members.

4. In a device of the character described, a driving member, a driven member, frictional disks interposed therebetween, means for successively engaging some of said elements with the member with which they are 75 associated to prevent relative rotation therebetween, and means between the last disk which is engaged with one member and a disk keyed to the other member for positively limiting the extent of rotation between 80 said members.

5. In a device of the character described, a driving member, a driven member, a plurality of frictional disks keyed to said drivvening disks being of different lengths and that disk having the longest key-way being provided with a slot of greater length than the key-way, and a pin carried by one of the disks fixed to the driving member and engaging in said slot.

6. In a device of the character described, a driving member, a driven member, frictional elements therebetween and respectively connected to said members. means for successively preventing the elements connected to one of said members from rotating in unison with those of the other member upon reversal of rotation of' the driving member, and means associated with said irictional elements for positively limiting the extent of rotation of the elements connected to one of said members relative to those associated with the other of said members.

BENGT M. W. HANSON. 

